[PSUBS-MAILIST] motor pod solution

[Alan via Personal_Submersibles]

Brian,
my latest thruster design is in 3 sections; a front section housing the mechanical
seal & a bearing, the back section housing a bearing & the wiring port, & a central
tubular section. The front & back sections have an o-ring groove & o-ring for sealing
on assembly. The 3 sections will be press fitted together then drilled,tapped & 
screwed. With the press fit I am regarding the central section as disposable as I
would probably have to cut in to it to part the sections. 
Cheers Alan

Sent from my iPad

> On 25/11/2017, at 12:27 PM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Hi All,        Been wrestling with my motor pods !   The way I decided to mate the two end caps to my motor casing was not the ideal method.  In fact I don't even remember ever seeing an arrangement like what I have.  I'm squeezing a 1/4" o ring between two 1/4" pieces of pipe and then have side rings inside and out to keep the o ring from expanding out of that area.  Surprisingly it has worked, probably only because there is next to zero pressure.  So not wanting to invite a bad situation of oil leaking into the ocean I decided I need to have a proper sealing scheme.  So that was going to mean I do a hatch style sealing arrangement with  14" dia stainless steel rings and a o ring groove etc..  So getting quotes on everything is was beginning to really add up , especially because the 14" pipe is just too big for my lathe , which means I would have to farm that part out !   The rings themselves were gong to be $600 for each motor pod !  So What I think I'm going to do is to just weld a 1/4" flat ring on both sides ( end cap and casing) regular steel,  put them together and then just weld a bead around edge and seal it that way.  Then if I need to get in there I will just grind off the bead and open it that way.  It will also be rather easy to weld it back together where I previously ground out the weld on that lip. 
>  
> Brian
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